Strategic use of call externalities for entry deterrence. The case of Polish mobile telephony market
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1 Strategic use of call externalities for entry deterrence. The case of Polish mobile telephony market Maciej Sobolewski, Mikołaj Czajkowski Faculty of Economics, University of Warsaw Presentation for ICMC 2017 Conference, Cape Town SA 1
2 Mobile & Externalities (Tele)communications generates two-sided benefits: sender s benefit and receiver s benefits B3 A1 Marginal cost of off-net call: c 0 + a B1 B2 Marginal cost of on-net call: 2c 0 Sender 1 in network A: Benefit α A1 >0 from call originating Receiver 1 in network B: Benefit β B1 >0 from answering a call 2 A2 Receiver 2 in network A: Benefits β A2 >0 a access/interconnection charge (regulated or not) c 0 - cost of call origination/termination in local loop / BTS cell
3 Literature network effects Network externalities extensively studied in economics since (Katz and Shapiro, 1985). In telecommunications: Are induced by termination based discrimination (Laffont et al., 1998) Are not homogenous across all members of the network (Maicas and Sese, 2011) Are localized among family and friends (Corrocher and Zirulia, 2009) Have diminishing marginal value and tend to exist even without on-net price discount (Czajkowski and Sobolewski, 2011) Drive consumer choices (Maicas et al. 2009b; Sobolewski and Czajkowski 2012) Impact network competition by creating lock-in (Doganoglu and Grzybowski 2007 ; Grajek 2010) 3
4 Problem set-up: call externalities The key insight from Jeon, Laffont, Tirole (2004): A sender obtains a gross surplus u(q) from a call of length q, while the receiver obtains a surplus of u q = βu q where (β > 0). Under calling-party-pays regime (CPP), duopoly competition with network-based discriminating networks i, j yields the following Nash equilibrium: p ii = 2c 0 (1+β) p ij = (1 s i)(c 0 +a) for s 1 (1+β)s i < 1 ; + otherwise. i 1+β On-net price is decreasing in receiver benefits (β) and set at social optimum Off-net price set above the social optimum; increasing in (β) and market share of call originating network (s i ) 4
5 Problem set-up: call externalities What are the implications? (Armstrong and Wright 2009 ; Hoernig, 2007; Calzada and Valletti 2008; Berger 2005). Under CPP, receiver benefits remain under control of originating network call externality. Distortionary effect on price differential. Overpricing effect has a negative impact on smaller networks, causing access deficit and connectivity breakdown (if β > 1 ). In the presence of receiver benefits and CPP, large network can put smaller ones into competitive disadvantage by reducing the volume of outgoing calls and lowering attractiveness of rival network. Bill and keep (a = 0 ) is welfare enhancing than a = c 0. 5
6 Empirical evidence Rojas (2017, IEPOL): Implement a DCE study on Ecuador subscribers; 42 choice tasks (!); each with two four-attribute alternatives (paid incoming calls) + opt out option; Estimating utilities from incoming and outgoing calls. Call externality coeffcienct: β = U p ij_inc / U p ij_out β = 0,67 for on-net calls β = 0,41 for of-net calls β = 0,79 for on-net calls pre-paid β = 0,27 for on-net calls post-paid 6
7 Market evidence - Poland Slow catching-up by late entrant (Play) 7
8 Objectives (1) To test the importance of CE and NE for the choice of mobile operator DCE to model subscription choices of pre- and post-paid users (2) To assess the impact of call externalities on the market share distribution Policy exercise: simulation of market share stealing effect experienced by the late entrant, under two counterfactual scenarios assuming reduced off-net price asymmetry between incumbent networks and late entrant. 8
9 Agenda Data and Methodology Results Conclusions 9
10 Data and Methodology Discrete choice experiment on two representative samples of prepaid (n = 1001) and postpaid (n = 1029) subscribers in June 2005 (IPSOS) Hypothetical choice scenario: Imagine new law is introduced at the EU level that does not allow to use unlimited mobile phone plans (stimulate price competition, people use mobile phones less than they think making average price per minute relatively high) Which offer would you choose? Ignore liabilities resulting from current contracts Assume alternatives are the same with respect to all other attributes Experimental design 4 labelled alternatives corresponding to the 4 main operators On-net price, off-net price, price for off-net incoming calls paid by originating party, family and friends in the same network, others in the same network 12 choice tasks per respondent; 3 blocks of choice tasks. Bayesian efficient design, based on priors from pretest phase 10
11 Data and Methodology We control for the following usuall drivers of choice: On-net prices Off-net prices Brand effects Personal network effects (utility increases with larger share of frequently called people subscribing to the same network as respondent) Switching costs (people are reluctant to change current operator status quo inertia) Receiver benefits are controlled indirectly with the third price attribute: average price level for incoming off-net calls paid by people who originate a call from other networks to a given network CPP setup If a person cares about the prices other have to pay when calling her or him in a given network then that person is sensitive to receiver benefits. Negative coefficient for incoming off-net price implies that respondent recognizes that this price negatively affect the traffic intensity of calls originated by others to him and hence reduces his or her receiver benefits. 11
12 Choice attributes and levels 12
13 Example of a choice card 13
14 Results MXL model (correlated parameters) Postpaid Prepaid Distribution Mean St. Dev. Mean St. Dev. Status quo inertia Lognormal 0.21*** 1.56*** 0.32*** 1.46*** Orange vs. Play (operator-specific constant) T-Mobile vs. Play (operator-specific constant) Plus vs. Play (operator-specific constant) Normal -0.27*** 1.50*** -0.33** 1.59*** Normal -0.43*** 1.52*** -0.56*** 1.79*** Normal -0.26*** 1.42*** -0.31*** 1.56*** On-net calls price per minute - Lognormal 2.18*** 1.14*** 2.17*** 1.31*** Off-net calls price per minute - Lognormal 1.59*** 1.43*** 1.48*** 1.69*** Incoming off-net calls price per minute - Lognormal 0.51*** 1.48*** 0.36*** 1.64*** Share of friends and family using the same operator (%) Share of other people using the same operator (%) 14 Normal 0.97*** 4.13*** 0.57*** 3.89*** Normal *** *** Switching costs, Call externalities, Personal network effects are all significant drivers of subscriber choices for both pre- and post-paid users. Postpaid β 0,32; prepaid β 0,24
15 Market evidence - Poland excessive overpricing? Markup benchmark: prices for off-net calls to Play (green line) should have been on average 29% lower throughout the period compared to actual levels of off-net prices set by the 3 incumbents in that period (violet line). 3MNO incumbent operators: Plus, Orange, T-Mobile MTR mobile termination rate = interconnection access charge 15
16 Simulated policy scenarios We simulate we simulate operator choice probabilities under: 1. The baseline, excessive off-net price discrimination 2. Assuming reduced asymmetry (reflecting asymmetry in MTRs) 3. Assuming full symmetry in off-net prices between large and small networks Simulation approach: We used respondents estimated utility function parameters and their individual-specific characteristics (such as the share of friends and family using the same operator or their current subscription) We simulated how operator choice probabilities would change if one of the counterfactual scenarios took place 16
17 Characteristics of the simulated policy scenarios Postpaid Prepaid Orange T-Mobile Plus Play Orange T-Mobile Plus Play Baseline Actual situation in On-net price Off-net price to incumbents Off-net price to entrant MTR Scenario 1 No excessive off-net price asymmetry On-net price Off-net price to incumbents Off-net price to entrant MTR Scenario 2 Fully symmetrical MTR and off-net prices On-net price Off-net price MTR Manipulation of off-net prices to entrant (in green rectangles) implies changes in the level of incoming off-net price attribute for late entrant (Play).
18 Operator choice probability differentials Scenario 1 (no excessive off-net price asymmetry) vs. the baseline Orange T-Mobile Plus ΔP s.e. Orange 1.34*** (0.21) T-Mobile 0.64*** (0.12) Postpaid Plus 0.52*** (0.09) Play 0.77*** (0.14) Overall 0.82*** (0.13) 95% c.i. (0.96;1.78) (0.43;0.91) (0.36;0.72) (0.55;1.10) (0.59;1.11) ΔP s.e. 0.36*** (0.05) 1.10*** (0.13) 0.34*** (0.05) 0.48*** (0.07) 0.58*** (0.06) Orange 0.11 (0.11) (- 0.10;0.34) 1.07*** (0.14) T-Mobile 0.17*** (0.07) Prepaid Plus 0.14** (0.07) Play 0.32*** (0.08) Overall 0.16** (0.08) (0.05;0.32) (0.01;0.28) (0.17;0.50) (0.02;0.33) 1.01*** (0.18) 0.93*** (0.15) 1.57*** (0.19) 1.09*** (0.15) 95% c.i. (0.28;0.46) (0.87;1.38) (0.26;0.44) (0.36;0.62) (0.47;0.71) (0.79;1.36) (0.65;1.37) (0.64;1.24) (1.24;1.95) (0.80;1.4) ΔP s.e. 1.08*** (0.14) 1.32*** (0.17) 1.86*** (0.23) 1.42*** (0.19) 1.43*** (0.17) 0.40*** (0.06) 0.37*** (0.05) 0.64*** (0.09) 0.52*** (0.08) 0.47*** (0.06) 95% c.i. (0.83;1.37) (1.01;1.69) (1.45;2.35) (1.07;1.83) (1.12;1.8) (0.31;0.52) (0.28;0.49) (0.47;0.83) (0.39;0.69) (0.36;0.61) Play ΔP s.e. 95% c.i *** (0.32) (-3.45;- 2.20) -3.06*** (0.36) (-3.82;- 2.43) -2.72*** (0.31) (-3.38;- 2.16) -2.67*** (0.31) (-3.36;- 2.14) -2.83*** (0.32) (-3.51;- 2.26) -1.58*** (0.27) (-2.14;- 1.09) -1.56*** (0.26) (-2.10;- 1.08) -1.70*** (0.27) (-2.27;- 1.20) -2.42*** (0.30) (-3.05;- 1.89) -1.72*** (0.26) (-2.28;- 1.24) 18 The magnitude of harm to the late entrant in terms of market share loss is moderate under actual regulatory policy (asymmetric interconnection charges).
19 Operator choice probability differentials Scenario 2 (fully symmetrical MTRs and off-net prices) vs. the baseline Orange T-Mobile Plus ΔP s.e. Orange 4.78*** (0.64) T-Mobile 2.15*** (0.35) Postpaid Plus 1.70*** (0.28) Play 2.13*** (0.36) Overall 2.77*** (0.38) Orange 1.66*** (0.34) T-Mobile 1.16*** (0.22) Prepaid Plus 1.16*** (0.22) Play 1.45*** (0.25) Overall 1.35*** (0.25) 95% c.i. (3.68;6.18) (1.55;2.93) (1.22;2.3) (1.54;2.93) (2.12;3.61) (1.04;2.37) (0.77;1.63) (0.77;1.62) (1.00;1.98) (0.90;1.88) ΔP s.e. 0.99*** (0.17) 3.25*** (0.41) 0.94*** (0.17) 1.22*** (0.21) 1.65*** (0.20) 3.55*** (0.54) 3.7*** (0.61) 3.68*** (0.56) 4.91*** (0.60) 3.82*** (0.54) 95% c.i. (0.7;1.36) (2.54;4.14) (0.66;1.31) (0.85;1.69) (1.29;2.08) (2.53;4.64) (2.46;4.9) (2.63;4.8) (3.81;6.16) (2.81;4.95) ΔP s.e. 2.93*** (0.42) 3.63*** (0.48) 5.87*** (0.68) 3.38*** (0.52) 4.10*** (0.49) 0.81*** (0.17) 0.79*** (0.17) 1.19*** (0.29) 1.13*** (0.21) 0.95*** (0.19) 95% c.i. (2.19;3.81) (2.76;4.65) (4.67;7.35) (2.46;4.49) (3.23;5.14) (0.52;1.17) (0.50;1.15) (0.67;1.79) (0.76;1.58) (0.60;1.35) Play ΔP s.e. 95% c.i *** (0.92) (-10.66;- 7.06) -9.03*** (0.99) (-11.17;- 7.3) -8.51*** (0.90) (-10.43;- 6.91) -6.73*** (0.84) (-8.54;- 5.23) -8.53*** (0.90) (-10.48;- 6.93) -6.02*** (0.88) (-7.82;- 4.39) -5.66*** (0.84) (-7.38;- 4.06) -6.03*** (0.89) (-7.88;- 4.37) -7.48*** (0.85) (-9.29;- 5.93) The magnitude of harm to the late entrant in terms of market share loss is substantial under alternative regulatory policy (symmetric interconnection charges) *** (0.85) (-7.89;- 4.56) 19
20 Conclusions Call externalities are among important drivers of mobile operator choice for both prepaid and postpaid subscribers, next to price effects, switching costs, network effects and brand effects. Consumers are discouraged to subscribe to networks for which incoming calls are higher. Above benchamark asymmetry in off-net calls between 3 incumbent MNO and new entrant had negative, albeit moderate, impact on market share of NE. In reduced asymmetry scenario, under a common markup benchmark NE would gain 2.8 p.p in market share in postpaid segment (1.7 in prepaid) Under full symmetry NE would gain 8.5 p.p (6.1 in prepaid) 20 Assymetric MTRs are costly for its beneficiaries. This has largely been overlooked in practical considerations.
21 Thank you for your time 21
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